[go: up one dir, main page]

Skip to main content
Log in

Kinetic and mechanism studies of the isothermal degradation of local chitin, chitosan and its biocomposite bentonite/chitosan

  • Original Paper
  • Published:
Cellulose Aims and scope Submit manuscript

Abstract

In this work, the kinetic and the mechanism of isothermal degradation of local chitin (CN), chitosan (CS) and the biocomposite Bentonite/Chitosan (5%Bt/CS) were investigated by thermogravimetric analysis in air atmosphere and in the temperatures range 285–330 °C. Fourier transform-infrared, X-ray diffractogram and differential scanning calorimetry analyses were used to determine the structure of the as prepared samples. DTG curves of the samples show that CN and CS presented one peak, while those of 5%Bt/CS presented one to three peaks as the isothermal degradation increases. This difference was linked to the strong interactions between CS and Bentonite, which improve the stability of CS in the biocomposite 5%Bt/CS. The common first DTG peak appearing in each sample was treated using the Friedman method, leading to the activation energy (Ea) of Ea(CN) = 127.18 kJ/mol > Ea(CS) = 103.90 kJ/mol > Ea(5%Bt/CS) = 80.64 kJ/mol. The auto-catalytic Sestak–Berggren model was found to be qualitatively matched the isothermal degradation process of each sample. The thermodynamic parameters show the appearance of an order in the activated complex with respect to the initial state and that the isothermal degradation process is endothermic and is not spontaneous.

Graphical Abstract

This is a preview of subscription content, log in via an institution to check access.

Access this article

Subscribe and save

Springer+ Basic
$34.99 /Month
  • Get 10 units per month
  • Download Article/Chapter or eBook
  • 1 Unit = 1 Article or 1 Chapter
  • Cancel anytime
Subscribe now

Buy Now

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12

Similar content being viewed by others

Explore related subjects

Discover the latest articles, news and stories from top researchers in related subjects.

References

Download references

Acknowledgments

This work was supported by MESRSFC and CNRST-Rabat-Morocco, within the framework of the PPR2 project.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Hamou Moussout.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Fig.S1 DTA curves of a chitin, b chitosan and b biocomposite 5%Bt/CS. (DOCX 283 kb)

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Moussout, H., Ahlafi, H., Aazza, M. et al. Kinetic and mechanism studies of the isothermal degradation of local chitin, chitosan and its biocomposite bentonite/chitosan. Cellulose 25, 5593–5609 (2018). https://doi.org/10.1007/s10570-018-1999-5

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10570-018-1999-5

Keywords

Navigation